Yes you can! Alfred supports an unlimited number of Camera and Viewer devices. All you have to do is to download Alfred on the devices, log in with the same Gmail, and set them as Viewer/Camera depending on your needs. Remember to log in with the same Gmail so Alfred can pair them up.

If you have more than one Viewer, use Alfred’s WebViewer, or have someone in your Trust Circle, please make sure all live-viewing sessions have been terminated on other devices before starting one with your current device.